SQL w Excelu: Odpytaj plik tekstowy za pomocą funkcji Excela

Drobna przeróbka mojego poprzedniego makra w celu czytania i kwerendy plików tekstowych w Excelu za pomocą funkcji:

Function SQL(fileName As String, kolumny As String) As Variant
    Application.Volatile
    
 
    Dim path As String

    Dim cn As ADODB.Connection
    Dim rs As ADODB.Recordset
    Dim currAddress As String
    Dim varHdr, varDat, contentOut As Variant
    Dim nc, nr, i, j As Long
    
    path = ThisWorkbook.path & "\Data\"
    
    SQL = Null
    
    'currAddress = ActiveSheet.Name & "$" & dataRange.Address(False, False)
    
    strFile = ThisWorkbook.FullName
    strCon = "Provider=Microsoft.ACE.OLEDB.12.0;" & _
               "Data Source=" & path & ";" & _
               "Extended Properties=""text; HDR=Yes; FMT=Delimited; IMEX=1;"""
    
    Set cn = CreateObject("ADODB.Connection")
    Set rs = CreateObject("ADODB.Recordset")
   
    rs.CursorLocation = adUseClient ' required to return the number of rows correctly
    cn.Open strCon
    
    strSQL = "select " & kolumny & " from " & fileName
    
    rs.Open strSQL, cn
    
    'Check if recordset is empty
    If rs.EOF Then
        MsgBox "Function does not return any values"
        SQL = ""
        Exit Function
    End If
    
    
    ' Process Column Headings
    nc = rs.Fields.Count
    ReDim varHdr(nc - 1, 0)
    For i = 0 To rs.Fields.Count - 1
        varHdr(i, 0) = rs.Fields(i).Name
    Next

    ' Get Rows from the Recordset
    nr = rs.RecordCount
    varDat = rs.GetRows

    ' Combing Header and Data and Transpose

    ReDim contentOut(0 To nr, 0 To nc - 1)
    For i = 0 To nc - 1
        contentOut(0, i) = varHdr(i, 0)
    Next

    
    
    
    For i = 1 To nr
        For j = 0 To nc - 1
           contentOut(i, j) = varDat(j, i - 1)
            
            
                
        Next
    Next

  ' Optional solution: Write Output Array to Sheet2
  '  With Sheet2
  '      .Cells.Clear
  '      .Range("A1").Resize(nr, nc) = contentOut
  '  End With
      
      
    'Figure out size of calling range which will receive the output array
    Dim nRow As Long: nRow = Application.Caller.Rows.Count
    Dim nCol As Long: nCol = Application.Caller.Columns.Count

    'Error if calling range too small
    If nRow < UBound(contentOut, 1) Or nCol < UBound(contentOut, 2) Then
        'Popup message
        'MsgBox "your range is too small."
        ' or return #VALUE! error
        SQL = "Too small range" 'CVErr(xlValue)
        ' or both or whatever else you want there to happen
        Exit Function
    End If

    'Initialise output array to match size of calling range
    Dim varOut As Variant
    ReDim varOut(1 To nRow, 1 To nCol)
    'And fill it with some background value
    Dim iRow As Long
    Dim iCol As Long
    For iRow = 1 To nRow
    
        For iCol = 1 To nCol
            varOut(iRow, iCol) = ""   ' or "funny bear", or whatever
        Next
    Next

    'Put content in output array and return
    For iRow = 0 To UBound(contentOut, 1)
        For iCol = 0 To UBound(contentOut, 2)
            varOut(iRow + 1, iCol + 1) = contentOut(iRow, iCol)
        Next
    Next
      
      
      
      SQL = varOut
    
    'Cleanup
    Erase contentOut
    Erase varHdr
    Erase varDat
    
    rs.Close
    Set rs = Nothing
    Set cn = Nothing


End Function